Chemical composition of Galactic OB stars II. The fast rotator Z Oph

Details Chemical composition of Galactic OB stars II. The fast rotator Z Oph Chemical composition of Galactic OB stars II. The fast rotator Z Oph

2005-07-18

arxiv.org/abs/astro-ph/0507400v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20052848

Z Oph, HD149757, is an O9.5 Vnn star with a very high projected rotational velocity (vsini >= 340 km\s). It is also a classical runaway star due to its high proper motion. We perform a quantitative analysis of its optical spectrum in order to measure important observables of the star such as its mass, effective temperature, luminosity and He, C, N, and O abundances. Comparing these observed values to those predicted by the rotating evolutionary models of the Geneva group we find that none of the two sets of models is capable of reproducing the characteristics of the star. Nevertheless, due to its runaway nature, the reason for this discrepancy may be that the star is not the result of the evolution of a single object, but the product of the evolution of a close binary system.

Affiliated with

Also associated with

No associations

Rating

Chemical composition of Galactic OB stars II. The fast rotator Z Oph does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Chemical composition of Galactic OB stars II. The fast rotator Z Oph, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chemical composition of Galactic OB stars II. The fast rotator Z Oph will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-187619